add cache file option to autoconf executor by default (if cflags and ldflags match default)

src/SPC/builder/linux/library/libffi.php

@@ -18,13 +18,8 @@ class libffi extends LinuxLibraryBase
      */
     public function build(): void
     {
-        $arch = getenv('SPC_ARCH');
         UnixAutoconfExecutor::create($this)
-            ->configure(
-                "--host={$arch}-unknown-linux",
-                "--target={$arch}-unknown-linux",
-                "--libdir={$this->getLibDir()}"
-            )
+            ->configure()
             ->make();
 
         if (is_file(BUILD_ROOT_PATH . '/lib64/libffi.a')) {